Charlie calls Desmond a coward and Desmond attacks CharlieWe see this scene twice in the episode.

Pre Desmond’s Flashback

Desmond: You don’t wanna know what happened to me, when I turned that keyCharlie: HelpDesmond: You don’t wanna knowHurley: Dude!Charlie: HelpDesmond: You don’t wanna knowCharlie: Get him offDesmond: You don’t want to know

After Desmond’s flashback

Desmond: You don’t wanna know what happened to me, when I turned that KeyCharlie: Get offDesmond: You don’t wanna knowCharlie: Get off meDesmond: You don’t wanna know what happened to meDesmond: you don’t wanna knowCharlie: CoughsDesmond: You don’t wanna know.